A flat gate valve

Abstract

The utility model discloses a flat gate valve relates to flat gate valve technical field, include: the medium passageway in the valve body inside, the valve plate is located in the valve body, and the medium passageway in the valve plate opening or closing the valve body, and the valve rod is connected to the valve plate, and the valve rod is connected with operating device, the valve seat is in the valve body, and the valve seat is located at both sides of the valve plate, the valve seat of both sides forms the sliding cavity, and the shape of sliding cavity is matched with the contour of valve plate, and the valve plate is located in the sliding cavity in the opening or closing moving process of valve plate, the utility model technical scheme, the sliding cavity is formed between the valve body and the valve seat, and the valve plate can only slide in the sliding cavity, and the shape of sliding cavity is matched with the contour of valve plate, and the cavity in the valve body is only the part of part cooperation gap and valve plate sliding, use this device, make the cavity in the valve body as little as possible.

Description

Technical Field

[0001] This utility model relates to the field of flat gate valve technology, and specifically to a flat gate valve. Background Technology

[0002] Flat gate valves are a type of sliding valve, with a parallel gate as the closing element. Due to their structural limitations, conventional flat gate valves typically have a large enclosed cavity inside the valve body. As the gate moves up and down, the passageway communicates with this cavity. When a conventional flat gate valve is used to transport particulate, coking, or self-polymerizing media, these media enter the valve body cavity during opening and closing. They then gradually accumulate and harden within the cavity, eventually preventing the valve from operating normally.

[0003] Chinese patent document CN113217649B discloses a high-temperature, high-pressure, wear-resistant, hard-seal flat gate valve. This gate valve has two valve seat assemblies on each side of the gate. Each valve seat assembly consists of a valve seat plate with a flow channel hole and a valve seat sealing layer. The valve seat sealing layer is located on the inner end face of the valve seat plate near the gate, contacting the gate sealing layer to form a sealing fit. A compression spring is installed in a compression spring hole on the edge of the valve seat plate and is in a compressed state. The thrust generated by this spring allows the valve seat plate to be tightly pressed against the gate, effectively reducing the gap between the valve seat plate and the gate, greatly reducing the amount of medium entering the valve body cavity from the flow channel, and thus preventing the formation of deposits in the cavity when there is no opening or closing operation for a long time.

[0004] However, even with the above solutions, the valve still has a large cavity. Once the sealing effect deteriorates, the medium can not be removed from the cavity and will accumulate and block it, eventually rendering the flat gate valve unusable.

[0005] Furthermore, when using the above solution, since the compression spring is installed on the edge of the valve seat plate, when the valve plate moves away from the valve seat, the valve seats on both sides will shift closer to each other under the action of the elastic force of the compression spring. As a result, when the valve is in the open state, the medium can easily enter the valve cavity. Utility Model Content

[0006] In view of this, the present invention provides a flat gate valve to solve the problem that existing valves have cavities where the medium can easily enter, causing the medium to accumulate and block the cavity.

[0007] This utility model provides a flat gate valve, comprising: Valve body, the interior of which has a medium passage; A valve plate is slidably disposed in the valve body. The valve plate is used to open or close the medium passage in the valve body by sliding. A valve stem is connected to the valve plate. One end of the valve stem extends out of the valve body and is connected to the operating device. A valve seat is disposed within the valve body, and the valve seat is located on both sides of the valve plate, forming a sliding seal between the valve seat and the valve plate; The valve seats on both sides together form a sliding cavity for the valve plate to slide. The shape of the sliding cavity matches the shape of the valve plate. During the opening or closing movement of the valve plate, the valve plate is always located in the sliding cavity.

[0008] In this utility model, the valve body and valve seat together form a sliding cavity, and the valve plate can only slide within the sliding cavity. The shape of the sliding cavity matches the shape of the valve plate, and the cavity inside the valve body is only the part where the valve plate slides. Using this device, the cavity inside the valve body is reduced.

[0009] Optionally, the valve plate is rectangular in shape, the sliding cavity is rectangular, and the length of the rectangular cavity along the sliding direction of the valve plate is greater than the length of the valve plate along the sliding direction.

[0010] Optionally, the valve body has a first purge hole and a second purge hole. The first purge hole penetrates the valve body and communicates with the upper part of the sliding cavity; the second purge hole penetrates the valve body and communicates with the lower part of the sliding cavity.

[0011] In the above scheme, to prevent a small amount of medium from entering the cavity inside the valve body due to wear of the gate and valve seat sealing surfaces after long-term opening and closing operations, it is cleaned by purging through the first and second purge holes.

[0012] Optionally, the first purge hole is located on the side of the valve body, and the second purge hole is located at the bottom of the valve body.

[0013] In the above scheme, high-pressure gas is introduced into the first purge port, and the medium exits through the second purge port to prevent the medium from accumulating in the cavity and being unable to be discharged.

[0014] Optionally, the valve body is a split structure, including: a central body, a left valve body and a right valve body, the left valve body and the right valve body being symmetrically connected to both sides of the central body, and the valve seat being sandwiched between the left valve body and the right valve body.

[0015] In the above scheme, the device is installed from the side, which reduces the volume of the valve body cavity as much as possible to prevent uneven force during use from causing the valve seat to tilt.

[0016] Optionally, the valve plate has a closed area and a through-hole area. The closed area has a first annular sealing surface that protrudes from the surface of the valve plate. After the valve plate is closed, it seals with the valve seat through the first annular sealing surface. The through-hole area has a second annular sealing surface that protrudes from the surface of the valve plate. After the valve plate is opened, it seals with the valve seat through the second annular sealing surface. The double annular sealing surfaces on the gate plate surface cooperate with the valve seat sealing surface to ensure that the medium does not easily enter the cavity inside the valve body during the valve opening and closing process.

[0017] The above solution ensures that the medium cannot enter the valve body cavity during the valve plate opening and closing process, while reducing the total contact area of ​​the valve plate and valve seat sealing surfaces. Under the same conditions, it has a higher sealing surface specific pressure and a better sealing effect.

[0018] Optionally, the valve seat has two separate parts, both of which are rectangular in structure, and each valve seat has a central hole in the middle that communicates with the medium channel.

[0019] In the above scheme, the medium passes through the central hole.

[0020] Optionally, the central hole has an annular flange extending in a direction away from the sliding cavity in the circumferential direction, and a seal is provided between the outer ring of the annular flange and the valve body.

[0021] In the above scheme, the seal prevents the medium from flowing through the gap between the valve body and the valve seat.

[0022] Optionally, at least one of the valve seats has an elastic element connected to the side away from the sliding cavity, the elastic element having an elastic force that drives the valve seat toward the sliding cavity.

[0023] In the above scheme, the elastic element provides preload, the valve seat is not prone to tilting, ensuring stable valve body sealing and preventing the sealing effect between the valve seat and the valve plate from deteriorating.

[0024] Optionally, the elastic element is disposed at the midpoint between the short side of the rectangular structure of the valve seat and the edge of the central hole, and at least two elastic elements are symmetrically arranged on the valve seat relative to the central hole.

[0025] The above solution enhances the sealing effect between the valve plate and the valve seat. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional view of a flat gate valve according to an embodiment of the present utility model; Figure 2 for Figure 1 The left view of the flat gate valve shown is with the left valve body and left valve seat hidden. Figure 3 for Figure 1 A perspective view of the valve plate in the flat gate valve shown in the figure; Figure 4 for Figure 1 A perspective view of the left valve seat in the flat gate valve shown; Figure 5 for Figure 1 A cross-sectional view of the valve plate during the closing process in the flat gate valve shown in the figure; Figure 6 for Figure 1 The diagram shows a cross-sectional view of the flat gate valve after the valve plate is closed.

[0028] Explanation of reference numerals in the attached figures: 1. Medium passage; 2. Valve plate; 3. Valve stem; 4. Operating device; 5. Valve seat; 6. Sliding cavity; 7. First purge hole; 8. Second purge hole; 9. Central body; 10. Left valve body; 11. Right valve body; 12. Sealing area; 13. Through hole area; 14. First annular sealing surface; 15. Second annular sealing surface; 16. Central hole; 17. Annular flange; 18. Sealing element; 19. Elastic element. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] like Figure 1 As shown, this is a specific implementation of the flat gate valve provided in this embodiment, which includes: valve body, valve plate 2 and valve seat 5.

[0034] like Figure 1 As shown, the valve body has a medium channel 1 inside; like Figure 1 As shown, the valve plate 2 is slidably disposed in the valve body. The valve plate 2 is used to open or close the medium channel 1 in the valve body by sliding. A valve stem 3 is connected to the valve plate 2. One end of the valve stem 3 extends out of the valve body and is connected to the operating device 4. like Figure 1 As shown, the valve seat 5 is disposed in the valve body, and the valve seat 5 is located on both sides of the valve plate 2, and a sliding seal is formed between the valve seat 5 and the valve plate 2; like Figure 1 As shown, the valve seats 5 on both sides together form a sliding cavity 6 for the valve plate 2 to slide. The shape of the sliding cavity 6 matches the shape of the valve plate 2. During the opening or closing movement of the valve plate 2, the valve plate 2 is always located in the sliding cavity 6.

[0035] In this embodiment, the valve body and valve seat 5 together form a sliding cavity 6. The valve plate 2 can only slide within the sliding cavity 6, and the shape of the sliding cavity 6 matches the shape of the valve plate 2. The cavity inside the valve body is the part where the valve plate 2 slides. Using this device, the cavity inside the valve body is reduced.

[0036] like Figure 1 , 3 As shown, the valve plate 2 is rectangular in shape, and the sliding cavity 6 is also rectangular. The length of the rectangular cavity along the sliding direction of the valve plate 2 is greater than the length of the valve plate 2 along the sliding direction. This design provides ample space for the valve plate 2 to slide within the sliding cavity 6. The rectangular shape of the valve plate 2 matches the rectangular sliding cavity 6, allowing for better contact with the sealing surface of the piping system when the valve plate 2 is closed, thus ensuring the valve's sealing performance.

[0037] Of course, the above description is not limiting. In some alternative embodiments, the shape of the valve plate 2 can be replaced with other shapes, such as circular.

[0038] like Figure 2 As shown, in some embodiments, a pair of parallel side surfaces of the valve plate 2 are slidably sealed to the valve seat 5, and another pair of parallel side surfaces of the valve plate 2 have gaps between them and the valve body. The valve body has a first purge hole 7 and a second purge hole 8. The first purge hole 7 penetrates the valve body and communicates with the upper part of the sliding cavity 6; the second purge hole 8 penetrates the valve body and communicates with the lower part of the sliding cavity 6. With this configuration, if some medium enters the cavity and causes blockage, it can be cleaned by purging through the first purge hole 7 and the second purge hole 8.

[0039] Of course, the above description is not limiting. In some alternative embodiments, the first purge hole 7 and the second purge hole 8 can be omitted. All four inner wall surfaces of the sliding cavity 6 can respectively slide and seal against the side wall of the valve plate 2.

[0040] like Figure 2 As shown, the first purge hole 7 is located on the side of the valve body, and the second purge hole 8 is located at the bottom of the valve body. With this configuration, high-pressure gas is introduced into the first purge hole 7, and the medium enters the sliding chamber 6, then passes through the gap between the valve body and the valve plate 2, and finally exits from the second purge hole 8, thereby cleaning the medium accumulated in the sliding chamber 6.

[0041] Of course, the above description is not limiting. In some alternative embodiments, the first purge port 7 and the second purge port 8 may be located on both sides of the valve body.

[0042] like Figure 1As shown, the valve body has a split structure, including: a central body 9, a left valve body 10, and a right valve body 11. The left valve body 10 and the right valve body 11 are symmetrically connected to both sides of the central body 9, and the valve seat 5 is sandwiched between the left valve body 10 and the right valve body 11. This arrangement allows the valve seat 5 and the valve body to be installed from the side of the valve plate 2, minimizing the volume of the valve body cavity and preventing uneven stress during use from causing the valve seat 5 to tilt.

[0043] Of course, the above description is not limiting; in some alternative embodiments, the valve body may be a single unit.

[0044] like Figure 3 As shown, the valve plate 2 has a closed area 12 and a through-hole area 13. The closed area 12 has a first annular sealing surface 14, which protrudes from the surface of the valve plate 2. After the valve plate 2 is closed, it seals with the valve seat 5 through the first annular sealing surface 14. The through-hole area 13 has a second annular sealing surface 15, which protrudes from the surface of the valve plate 2. After the valve plate 2 is opened, it seals with the valve seat 5 through the second annular sealing surface 15. Specifically, after the valve plate 2 is opened, the first annular sealing surface 14 is tightly fitted with the area outside the central hole 16, and the second annular sealing surface 15 coincides with the central hole 16. After the valve plate 2 is closed, the first annular sealing surface 14 coincides with the central hole 16, and the second annular sealing surface 15 is tightly fitted with the area outside the central hole 16. This design reduces the total contact area between the sealing surfaces of valve plate 2 and valve seat 5, resulting in a higher sealing surface specific pressure under the same conditions and a better sealing effect. The double-ring sealing surface on the gate plate surface cooperates with the sealing surface of the valve seat to ensure that the medium does not easily enter the cavity inside the valve body during the valve opening and closing process.

[0045] Of course, the above description is not limiting. In some alternative embodiments, the first annular sealing surface 14 and the second annular sealing surface 15 may be omitted.

[0046] like Figure 1 , 4 As shown, the valve seat 5 has two separate parts, both of which are rectangular in structure. Each valve seat 5 has a central hole 16 that communicates with the medium channel 1. This arrangement allows the medium to pass through the central hole 16.

[0047] Of course, the above description is not limiting. In some alternative embodiments, the valve seat 5 can be a single unit.

[0048] like Figure 4 , 5As shown, the central hole 16 has an annular flange 17 extending circumferentially away from the sliding cavity 6, and a seal 18 is provided between the outer ring of the annular flange 17 and the valve body. This arrangement prevents the medium from flowing through the gap between the valve body and the valve seat 5.

[0049] Of course, the above description is not limiting, and in some alternative embodiments, the seal 18 may be omitted.

[0050] like Figure 5 As shown, at least one of the valve seats 5 has an elastic element 19 connected to the side away from the sliding cavity 6. The elastic element 19 has an elastic force that drives the valve seat 5 toward the sliding cavity 6. With this configuration, the elastic element 19 provides a preload force to ensure stable valve body sealing and prevent the sealing effect between the valve seat 5 and the valve plate 2 from deteriorating.

[0051] Of course, the above description is not limiting, and in some alternative embodiments, the elastic element 19 may be omitted.

[0052] like Figure 6 As shown, the elastic element 19 is positioned at the midpoint between the short side of the rectangular structure of the valve seat 5 and the edge of the central hole 16. At least two elastic elements 19 are symmetrically arranged on the valve seat 5 relative to the central hole 16. This arrangement ensures that during the movement of the valve plate 2, the force exerted by the elastic element 19 furthest from the valve plate 2, which causes the valve seat 5 to tilt, is smaller, making it less prone to tilting and thus guaranteeing the sealing effect between the valve plate 2 and the valve seat 5.

[0053] Of course, the above description is not limiting; in some alternative embodiments, one elastic element 19 may be provided.

[0054] Usage: Install the valve seat 5 on the outside of the valve plate 2, install the valve body on the outside of the valve seat 5, install the valve stem 3 on the top of the valve plate 2, pass through the valve body and connect to the operating device 4. When using the device, the first annular sealing surface 14 is tightly fitted with the valve seat 5, and the medium passes through the medium channel 1 and the central hole 16. Control the operating device 4 to make the valve stem 3 drive the valve plate 2 to slide until the sealing area 12 completely blocks the central hole 16.

[0055] Using this device, the cavity inside the valve body is reduced, and the double annular sealing surface on the gate surface cooperates with the valve seat sealing surface to ensure that the medium does not easily enter the cavity inside the valve body during valve opening and closing.

[0056] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A flat gate valve, characterized in that, include: Valve body, the interior of which has a medium channel (1); A valve plate (2) is slidably disposed in the valve body. The valve plate (2) is used to open or close the medium channel (1) in the valve body by sliding. A valve stem (3) is connected to the valve plate (2). One end of the valve stem (3) extends out of the valve body and is connected to the operating device (4). A valve seat (5) is disposed in the valve body. The valve seat (5) is located on both sides of the valve plate (2). A sliding seal is formed between the valve seat (5) and the valve plate (2). The valve seats (5) on both sides together form a sliding cavity (6) for sliding the valve plate (2). The shape of the sliding cavity (6) matches the shape of the valve plate (2). During the opening or closing movement of the valve plate (2), the valve plate (2) is always located in the sliding cavity (6).

2. The flat gate valve according to claim 1, characterized in that, The valve plate (2) is rectangular in shape, and the sliding cavity (6) is a rectangular cavity. The length of the rectangular cavity along the sliding direction of the valve plate (2) is greater than the length of the valve plate (2) along the sliding direction.

3. The flat gate valve according to claim 1, characterized in that, The valve body has a first purge hole (7) and a second purge hole (8). The first purge hole (7) passes through the valve body and communicates with the upper part of the sliding cavity (6). The second purge hole (8) passes through the valve body and communicates with the lower part of the sliding cavity (6).

4. The flat gate valve according to claim 3, characterized in that, The first purge hole (7) is located on the side of the valve body, and the second purge hole (8) is located at the bottom of the valve body.

5. The flat gate valve according to claim 1, characterized in that, The valve body is a split structure, including: a central body (9), a left valve body (10) and a right valve body (11). The left valve body (10) and the right valve body (11) are symmetrically connected on both sides of the central body (9), and the valve seat (5) is sandwiched between the left valve body (10) and the right valve body (11).

6. The flat gate valve according to claim 1, characterized in that, The valve plate (2) has a closed area (12) and a through hole area (13). The closed area (12) has a first annular sealing surface (14), which protrudes from the surface of the valve plate (2). After the valve plate (2) is closed, it seals with the valve seat (5) through the first annular sealing surface (14). The through hole area (13) has a second annular sealing surface (15), which protrudes from the surface of the valve plate (2). After the valve plate (2) is opened, it seals with the valve seat (5) through the second annular sealing surface (15).

7. The flat gate valve according to any one of claims 1-6, characterized in that, The valve seat (5) has two separate parts, both of which are rectangular in structure, and the valve seat (5) has a central hole (16) in the middle that communicates with the medium channel (1).

8. The flat gate valve according to claim 7, characterized in that, The central hole (16) has an annular flange (17) extending in a direction away from the sliding cavity (6) in the circumferential direction, and a seal (18) is provided between the outer ring of the annular flange (17) and the valve body.

9. The flat gate valve according to claim 7, characterized in that, At least one of the valve seats (5) has an elastic element (19) connected on the side away from the sliding cavity (6), the elastic element (19) having an elastic force that drives the valve seat (5) toward the sliding cavity (6).

10. The flat gate valve according to claim 9, characterized in that, The elastic element (19) is located at the middle position between the short side of the rectangular structure of the valve seat (5) and the edge of the central hole (16). There are at least two elastic elements (19) symmetrically arranged on the valve seat (5) relative to the central hole (16).

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